How do you deal with a Schrodinger's rogue?
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Chronoi Wardens of the Infinity Guard gain these charms along with their rank promotion to ensure they do not prematurely fall in battle. The few who used its power have described the feeling of simultaneous conscious and unconscious states as "existentially terrifying."
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Superposition Charm
Wondrous item, very rare
Dual-State. If you are reduced to 0 hit points while you wear this charm, you can use a reaction to delay falling unconscious or dying by superimposing your personal state between consciousness, unconsciousness, and death. While you remain superimposed, you don't need to make death saves, but you still fail death saves as normal whenever you take damage. Until this superposition ends, roll a d20 at the end of each of your turns or whenever you would die. On a roll of 11 or higher, you remain superimposed. On a roll of 10 or lower, the superposition ends. This state also ends if you regain any amount of hit points.
When the superposition ends, you return to consciousness, unconsciousness, or death depending on your current circumstance. You become conscious if your hit points are higher than 0; you fall unconscious if you have less than three death save failures; you die if you have more than three death save failures or death caused you to end the superimposition. If you die when the superposition ends, you cannot be revived by any effect short of a resurrection spell.
Once you use the charm’s reaction, the charm’s marble crumbles and the rest becomes a nonmagical mundane trinket.